Take a look at the link below:
About.com: http://www.okladot.state.ok.us/newsmedia/i40-okc/maps/Corridor-Aerial050630b.pdf
You can see all the connections yourself.
In regards to your second question, I believe the Robinson ramp is still on schedule. They are not scheduled to complete I-40 until 2012 so some sort of access to downtown is a high priority I would believe.
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